Paleozoic geodynamics and architecture of the Mongolian Altai Zone

The Mongolian Altai Zone is a part of the extensive Cambrian-Ordovician accretionary system located at the junction of the Siberian craton to the north and Tarim and North China cratons to the south. It extends approximately 2,000 km from Russia to Mongolia and represents one of the critical element...

Descripción completa

Detalles Bibliográficos
Autores: Sukhbaatar, Turbold, Lexa, Ondrej, Schulmann, Karel, Aguilar Gil, Carmen María, típská, Pavla, Wong, Jean, Jiang, Yingde, Míková, Jitka, Zhao, Dingy
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2022
País:España
Institución:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
Repositorio:Recercat. Dipósit de la Recerca de Catalunya
OAI Identifier:oai:recercat.cat:2445/187103
Acceso en línea:https://hdl.handle.net/2445/187103
Access Level:acceso abierto
Palabra clave:Geodinàmica
Paleozoic
Geodynamics
Paleozoic period
id ES_5c57a8a798dbbe867dcd7b01d529060f
oai_identifier_str oai:recercat.cat:2445/187103
network_acronym_str ES
network_name_str España
repository_id_str
spelling Paleozoic geodynamics and architecture of the Mongolian Altai ZoneSukhbaatar, TurboldLexa, OndrejSchulmann, KarelAguilar Gil, Carmen Maríatípská, PavlaWong, JeanJiang, YingdeMíková, JitkaZhao, DingyGeodinàmicaPaleozoicGeodynamicsPaleozoic periodThe Mongolian Altai Zone is a part of the extensive Cambrian-Ordovician accretionary system located at the junction of the Siberian craton to the north and Tarim and North China cratons to the south. It extends approximately 2,000 km from Russia to Mongolia and represents one of the critical elements for reconstructing the early Paleozoic geodynamics of the Central Asian Orogenic Belt (CAOB). The studied section comprises a succession of deformed low- and high-grade metasedimentary rocks characterised by dominant terrigenous components mixed with volcanogenic material. The detrital zircons analysis revealed two separate groups a) more mature siliciclastic sediments (mostly sandstones) with maximum depositional age of Cambrian-Ordovician (ca. 463-489 Ma; zircon U-Pb) and b) more juvenile greywacke type sediments with Ordovician-Silurian (ca. 438-446 Ma; zircon U-Pb) maximum depositional age. UPb ages of detrital zircons show Cambrian-Ordovician (εHf(t) values -24.8 to +16.0) and Late Archean to Neoproterozoic source (εHf(t) values -35.5 to +10.4) and are interpreted as derived from the Ikh Mongol continental arc and the Baydrag continent. The greywackes, in addition, contain Silurian detrital zircons, with εHf(t) values from -0.5 to +13, suggesting syn-depositional contribution of juvenile material from a nearby magmatic arc. Both types of sediments are affected by Devonian (ca. 369-382 Ma; zircon U-Pb) metamorphism and magmatism granites, as well as stroingly reworked during the Permian (ca. 271-296; zircon U-Pb) under various metamorphic conditions. Late Devonian granitoids associated with felsic migmatites, and their zircon εHf(t) values from -9.5 to +13.5, indicate extensive melting of the sedimentary pile. A Permian high-temperature metamorphism is associated with granodiorite intrusions (εHf(t) values from -22.0 to +12.6) that contain Devonian zircon xenocrysts, suggesting melting of a Devonian source. The tectonic evolution of the Mongolian Altai Zone can be discretized in four events from which the first two were related to early Paleozoic metamorphic and magmatic evolution. The third one is associated with crustal-scale detachment that exhumed the early Permian migmatitemagmatite core complex in the south. The whole edifice was later affected by significant PermianTriassic horizontal N-S shortening leading to juxtaposition of contrasting crustal levels thereby forming 'apparent' terrane structure of the Mongolian Altai Zone. The whole edifice is interpreted as a Cambrian to Silurian fore-arc, affected by Devonian syn-extensional deep crustal melting. In addition, the Permian anatectic zone is interpreted as a deep part of an inverted continental rift.European Geosciences Union (EGU)2022202220222022info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersion2 p.application/pdfhttps://hdl.handle.net/2445/187103Articles publicats en revistes (Mineralogia, Petrologia i Geologia Aplicada)reponame:Recercat. Dipósit de la Recerca de Catalunyainstname:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)InglésReproducció del document publicat a: https://doi.org/10.5194/egusphere-egu22-4701Geophysical Research Abstracts, 2022, vol. 22, num. 4701https://doi.org/10.5194/egusphere-egu22-4701cc-by (c) Sukhbaatar, Turbold et al., 2022https://creativecommons.org/licenses/by/4.0/info:eu-repo/semantics/openAccessoai:recercat.cat:2445/1871032026-05-29T05:05:01Z
dc.title.none.fl_str_mv Paleozoic geodynamics and architecture of the Mongolian Altai Zone
title Paleozoic geodynamics and architecture of the Mongolian Altai Zone
spellingShingle Paleozoic geodynamics and architecture of the Mongolian Altai Zone
Sukhbaatar, Turbold
Geodinàmica
Paleozoic
Geodynamics
Paleozoic period
title_short Paleozoic geodynamics and architecture of the Mongolian Altai Zone
title_full Paleozoic geodynamics and architecture of the Mongolian Altai Zone
title_fullStr Paleozoic geodynamics and architecture of the Mongolian Altai Zone
title_full_unstemmed Paleozoic geodynamics and architecture of the Mongolian Altai Zone
title_sort Paleozoic geodynamics and architecture of the Mongolian Altai Zone
dc.creator.none.fl_str_mv Sukhbaatar, Turbold
Lexa, Ondrej
Schulmann, Karel
Aguilar Gil, Carmen María
típská, Pavla
Wong, Jean
Jiang, Yingde
Míková, Jitka
Zhao, Dingy
author Sukhbaatar, Turbold
author_facet Sukhbaatar, Turbold
Lexa, Ondrej
Schulmann, Karel
Aguilar Gil, Carmen María
típská, Pavla
Wong, Jean
Jiang, Yingde
Míková, Jitka
Zhao, Dingy
author_role author
author2 Lexa, Ondrej
Schulmann, Karel
Aguilar Gil, Carmen María
típská, Pavla
Wong, Jean
Jiang, Yingde
Míková, Jitka
Zhao, Dingy
author2_role author
author
author
author
author
author
author
author
dc.subject.none.fl_str_mv Geodinàmica
Paleozoic
Geodynamics
Paleozoic period
topic Geodinàmica
Paleozoic
Geodynamics
Paleozoic period
description The Mongolian Altai Zone is a part of the extensive Cambrian-Ordovician accretionary system located at the junction of the Siberian craton to the north and Tarim and North China cratons to the south. It extends approximately 2,000 km from Russia to Mongolia and represents one of the critical elements for reconstructing the early Paleozoic geodynamics of the Central Asian Orogenic Belt (CAOB). The studied section comprises a succession of deformed low- and high-grade metasedimentary rocks characterised by dominant terrigenous components mixed with volcanogenic material. The detrital zircons analysis revealed two separate groups a) more mature siliciclastic sediments (mostly sandstones) with maximum depositional age of Cambrian-Ordovician (ca. 463-489 Ma; zircon U-Pb) and b) more juvenile greywacke type sediments with Ordovician-Silurian (ca. 438-446 Ma; zircon U-Pb) maximum depositional age. UPb ages of detrital zircons show Cambrian-Ordovician (εHf(t) values -24.8 to +16.0) and Late Archean to Neoproterozoic source (εHf(t) values -35.5 to +10.4) and are interpreted as derived from the Ikh Mongol continental arc and the Baydrag continent. The greywackes, in addition, contain Silurian detrital zircons, with εHf(t) values from -0.5 to +13, suggesting syn-depositional contribution of juvenile material from a nearby magmatic arc. Both types of sediments are affected by Devonian (ca. 369-382 Ma; zircon U-Pb) metamorphism and magmatism granites, as well as stroingly reworked during the Permian (ca. 271-296; zircon U-Pb) under various metamorphic conditions. Late Devonian granitoids associated with felsic migmatites, and their zircon εHf(t) values from -9.5 to +13.5, indicate extensive melting of the sedimentary pile. A Permian high-temperature metamorphism is associated with granodiorite intrusions (εHf(t) values from -22.0 to +12.6) that contain Devonian zircon xenocrysts, suggesting melting of a Devonian source. The tectonic evolution of the Mongolian Altai Zone can be discretized in four events from which the first two were related to early Paleozoic metamorphic and magmatic evolution. The third one is associated with crustal-scale detachment that exhumed the early Permian migmatitemagmatite core complex in the south. The whole edifice was later affected by significant PermianTriassic horizontal N-S shortening leading to juxtaposition of contrasting crustal levels thereby forming 'apparent' terrane structure of the Mongolian Altai Zone. The whole edifice is interpreted as a Cambrian to Silurian fore-arc, affected by Devonian syn-extensional deep crustal melting. In addition, the Permian anatectic zone is interpreted as a deep part of an inverted continental rift.
publishDate 2022
dc.date.none.fl_str_mv 2022
2022
2022
2022
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv https://hdl.handle.net/2445/187103
url https://hdl.handle.net/2445/187103
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Reproducció del document publicat a: https://doi.org/10.5194/egusphere-egu22-4701
Geophysical Research Abstracts, 2022, vol. 22, num. 4701
https://doi.org/10.5194/egusphere-egu22-4701
dc.rights.none.fl_str_mv cc-by (c) Sukhbaatar, Turbold et al., 2022
https://creativecommons.org/licenses/by/4.0/
info:eu-repo/semantics/openAccess
rights_invalid_str_mv cc-by (c) Sukhbaatar, Turbold et al., 2022
https://creativecommons.org/licenses/by/4.0/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv 2 p.
application/pdf
dc.publisher.none.fl_str_mv European Geosciences Union (EGU)
publisher.none.fl_str_mv European Geosciences Union (EGU)
dc.source.none.fl_str_mv Articles publicats en revistes (Mineralogia, Petrologia i Geologia Aplicada)
reponame:Recercat. Dipósit de la Recerca de Catalunya
instname:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
instname_str Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
reponame_str Recercat. Dipósit de la Recerca de Catalunya
collection Recercat. Dipósit de la Recerca de Catalunya
repository.name.fl_str_mv
repository.mail.fl_str_mv
_version_ 1869408905593880576
score 15,812429

Similares en LA Referencia